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Copolymerization of ethylene with 5‐vinyl‐2‐norbornene in the presence of the Ph 2 C(Flu)(Cp)ZrCl 2 /MAO catalyst
Author(s) -
Lasarov Harri,
Pakkanen Tuula T.
Publication year - 2000
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20000901)201:14<1780::aid-macp1780>3.0.co;2-l
Subject(s) - comonomer , norbornene , copolymer , polymer chemistry , ethylene , chemistry , metallocene , catalysis , double bond , reactivity (psychology) , polymerization , organic chemistry , polymer , medicine , alternative medicine , pathology
Cycloolefin copolymer, poly[(ethylene)‐ co ‐(5‐vinyl‐2‐norbornene)], was synthetized using the MAO activated ansa ‐metallocene Ph 2 C(Flu)(Cp)ZrCl 2 as a catalyst. Formation of mostly isolated 5‐vinyl‐2‐norbornene sequences was confirmed by NMR analysis. Comonomer incorporated selectively via cyclic double bond. No selectivity towards the reactivity of the particular isomer of 5‐vinyl‐2‐norbornene (5‐ endo : 5‐ exo ) was observed. The molar mass was found to decrease when the comonomer concentration in product increased. At low comonomer incorporation levels copolymers were insoluble, cross‐linked elastomers. With high comonomer concentration in reaction medium copolymers were amorphous determined by means of DSC and X‐ray diffraction and the vinyl group of the comonomer remained unreacted for further modification.